Fat in lactation rations: review.

@article{Palmquist1980FatIL,
  title={Fat in lactation rations: review.},
  author={Donald L. Palmquist and Thomas C. Jenkins},
  journal={Journal of dairy science},
  year={1980},
  volume={63 1},
  pages={
          1-14
        }
}
Recent research has demonstrated the effectiveness of added fat in diets to maintain milk production and fat percent. Much of the earlier work which indicated that fat affects digestion negatively may not be applicable because of great differences in the nature of diets and fats fed and especially in total feed intake. Nevertheless, much remains to be learned about interactions of fat, fiber, calcium, and rumen microorganisms if feeding of fat is to be maximized. The uniquely high acidity in… Expand
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References

SHOWING 1-10 OF 117 REFERENCES
Relationship of certain milk fat depressing diets to changes in the proportions of the volatile fatty acids produced in the rumen.
Summary Twelve high-producing Holstein cows were used to study the effect of feeding cod liver oil and a high-grain restricted roughage ration on milk and fat production, fatty acid composition ofExpand
The effect of dietary fat supplements on cholesterol metabolism in ruminants.
TLDR
The hypercholesterolemia that develops in fat-fed ruminants appears to be primarily due to an increased intestinal biosynthesis of cholesterol but may also be partly due to a decreased fecal excretion of bile acids. Expand
Dietary lipid metabolism in lactating dairy cows.
TLDR
A preliminary evaluation of supplement effects upon lipoprotein patterns of serum indicated two peaks in the lowdensity lipop protein class and that the increase in total cholesterol of blood caused by feeding lipid supplement is due to increases in cholesterol content of the low density and high density lipop Protein classes. Expand
Responses in rumen fermentation and milk-fat secretion in cows receiving low-roughage diets supplemented with protected tallow
TLDR
It is concluded that in the ‘low-fat syndrome’ the capacity of the mammary gland to absorb preformed fatty acids is not impaired and the effects of low-roughage diets on milk-fat secretion are discussed. Expand
Effect of feeding fat to dairy cows receiving a fat-deficient basal diet. II. Fatty acid composition of the milk fat.
TLDR
It was found that a linear relation was obtained between the dietary intake of C18 fatty acids and their output in milk fat, and a similar relation was found for the C16 acids. Expand
The effects of increasing amounts of dietary tallow on milk-fat secretion in the cow.
TLDR
Apart from butyric acid which increased, the yields of other short-chain acids synthesized within the mammary gland decreased with increased intake of tallow, and possible factors influencing the output of total milk fat through a balance between increased transfer to milk of dietary fatty acids and decreased intramammary synthesis of fatty acids are discussed. Expand
Effects of Feeding Raw Soybeans on Rumen Metabolism and Milk Composition of Dairy Cows
Abstract Four rumen-fistulated Holstein cows were used in a three-period reversal feeding trial to determine the effects of feeding raw soybeans on milk yield, gross composition of milk, componentExpand
Effect of feeding fat to dairy cows receiving a fat-deficient basal diet. I. Milk yield and composition.
TLDR
The yields of milk and milk fat were greatly increased by all the oil-supplemented diets; the mean daily yield of solids-not-fat (SNF) was also increased, but supplementation with soya oil caused the yield of crude protein to decrease, whereas the other fat-rich concentrate mixtures gave the same mean yield of protein as did the low-fat, control diet. Expand
Increased polyunsaturated fatty acid yields in milk cows fed protected fat.
TLDR
Increased mammary gland uptake of 18 carbon fatty acid inhibited de novo synthesis of fatty acids by mammary tissue in Jersey cows receiving the protected supplement. Expand
Effects of long supplementation with lipids on lactating dairy cows.
TLDR
There was indication that the supplement increased lactational performance during early lactation, and this apparent advantage was more than offset by a subsequent depression in milk yields and shortcoming of lactation in several cows under the ad lib feeding regime. Expand
...
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4
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